<script setup lang="ts">
import { ref, reactive, watch } from 'vue'
import type { FormInstance, FormRules } from 'element-plus'
import { User, Lock } from '@element-plus/icons-vue'
import { userRegisterService, userLoginService } from '@/api/user'
import { useUserStore } from '@/stores'
import { useRouter } from 'vue-router'

const registered = ref(false)

const ruleForm = reactive({
  username: '',
  password: '',
  repassword: ''
})
watch(registered, () => {
  ruleForm.username = ''
  ruleForm.password = ''
  ruleForm.repassword = ''
})

const validateRePass = (rule: any, value: any, callback: any) => {
  if (!value) {
    callback(new Error('请再次输入密码'))
  } else if (value !== ruleForm.password) {
    callback(new Error('两次输入密码不一致'))
  } else {
    callback()
  }
}

const rules = reactive<FormRules<typeof ruleForm>>({
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    { min: 5, max: 10, message: '用户名必须是 5-10位 的字符', trigger: 'blur' }
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    {
      pattern: /^\S{6,15}$/,
      message: '密码必须是 6-15位 的非空字符',
      trigger: 'blur'
    }
  ],
  repassword: [{ validator: validateRePass, trigger: 'blur' }]
})

const ruleFormRef = ref<FormInstance>() // 与表单DOM元素绑定

const register = async (form: FormInstance | undefined) => {

  if (!form) return
  form.validate(async (valid) => {
    if (valid) {
      try {
        const { data: [message] } = await userRegisterService(ruleForm)
        ElMessage.success(message)
      } catch (error: any) {
        const msg = error.response.data.detail
        ElMessage.error(msg)
      }

      registered.value = false
    } else {
      ElMessage.error('注册信息提交失败！')
      return Promise.reject(false)
    }
  })
}

const userStore = useUserStore()
const router = useRouter()
const login = async (form: FormInstance | undefined) => {
  if (!form) return
  form.validate(async (valid) => {
    if (valid) {
      try {
        const {
          data: { data: { username }, message }
        } = await userLoginService(ruleForm)
        await userStore.getUser(username)
        ElMessage.success(message)
        router.push('/')
      } catch (error: any) {
        if (error.response) {
          const msg = error.response.data.detail
          ElMessage.error(msg)
        }

      }
    } else {
      ElMessage.error('登录信息验证失败！')
      return Promise.reject(false)
    }
  })
}
</script>
<template>
  <el-row class="login-page">
    <el-col :span="12" class="bg" />
    <el-col :span="6" :offset="3" class="form">
      <!-- 注册表单 -->
      <!-- model 表示绑定的数据对象 rule 绑定的规则对象 -->
      <el-form ref="ruleFormRef" :model="ruleForm" :rules="rules" size="large" autocomplete="off" v-if="registered">
        <el-form-item>
          <el-text tag="b" type="success">注册</el-text>
        </el-form-item>
        <!-- prop 表示选择的对应规则 -->
        <el-form-item prop="username">
          <el-input v-model="ruleForm.username" :prefix-icon="User" placeholder="请输入用户名"></el-input></el-form-item>
        <el-form-item prop="password">
          <el-input v-model="ruleForm.password" :prefix-icon="Lock" type="password" placeholder="请输入密码"></el-input>
        </el-form-item>
        <el-form-item prop="repassword">
          <el-input v-model="ruleForm.repassword" :prefix-icon="Lock" type="password" placeholder="请再次输入密码">
          </el-input>
        </el-form-item>
        <el-form-item>
          <el-button @click="register(ruleFormRef)" class="button" type="success" auto-insert-space>注册</el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="registered = false">返回登录</el-link>
        </el-form-item>
      </el-form>
      <!-- 登录表单 -->
      <el-form ref="ruleFormRef" :model="ruleForm" :rules="rules" autocomplete="off" v-else>
        <el-form-item>
          <el-text tag="b" type="primary">登录</el-text>
        </el-form-item>
        <el-form-item prop="username">
          <el-input v-model="ruleForm.username" :prefix-icon="User" placeholder="请输入用户名"></el-input></el-form-item>
        <el-form-item prop="password">
          <el-input v-model="ruleForm.password" :prefix-icon="Lock" type="password" placeholder="请输入密码"></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox>记住我</el-checkbox>
            <el-link type="primary" :underline="false">忘记密码？</el-link>
          </div>
        </el-form-item>
        <el-form-item>
          <el-button @click="login(ruleFormRef)" class="button" type="primary" auto-insert-space>登录</el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="registered = true">前往注册</el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>
<style lang="scss" scoped>
.login-page {
  height: 100vh;
  background-color: #fff;

  .bg {
    background: url('@/assets/login-bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }


  .form {
    display: flex;
    flex-direction: column; // 子元素垂直排列
    justify-content: center; // 子元素垂直居中
    user-select: none; // 文本不可选

    .el-text {
      font-size: 25px;
      font-weight: bold;
      font-family: "Times New Roman", Times, serif;
    }

    .button {
      width: 100%;
    }

    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between; // 子元素之间的空间相等且尽可能填充满
    }
  }
}
</style>
